I dont think hey have screwed up vanguard tanking
As it works in TFB + SV NiM at the moment
pve tanks, they're fine. pve dps, they might not have enough sustained pop for server first teams, but it's not difficult to play tactics against a script, and pyro doesn't have to worry about getting cleansed.
...what I'm trying to say here is the really broken part is in pvp. they're the last choice in tank and everything they do for dps, every other tanking AC has a preferable spec.